EP0788271B1 - Agencement de circuit pour la génération d'impulsions de taxation - Google Patents

Agencement de circuit pour la génération d'impulsions de taxation Download PDF

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Publication number
EP0788271B1
EP0788271B1 EP97400135A EP97400135A EP0788271B1 EP 0788271 B1 EP0788271 B1 EP 0788271B1 EP 97400135 A EP97400135 A EP 97400135A EP 97400135 A EP97400135 A EP 97400135A EP 0788271 B1 EP0788271 B1 EP 0788271B1
Authority
EP
European Patent Office
Prior art keywords
interface unit
circuit
subscriber
exchange
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97400135A
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German (de)
English (en)
Other versions
EP0788271A3 (fr
EP0788271A2 (fr
Inventor
Werner Dipl.-Ing. Klamt
Thomas Dipl.-Ing. Bratschke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nvidia International Inc
Original Assignee
Nvidia International Inc
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Filing date
Publication date
Application filed by Nvidia International Inc filed Critical Nvidia International Inc
Publication of EP0788271A2 publication Critical patent/EP0788271A2/fr
Publication of EP0788271A3 publication Critical patent/EP0788271A3/fr
Application granted granted Critical
Publication of EP0788271B1 publication Critical patent/EP0788271B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal

Definitions

  • the invention relates to a circuit arrangement for generating charge pulses in digital message transmission, in which participants of a telephone network are connected via cables to a central office, in which the telephones of the participants are connected via electrical connection lines to an interface unit connected to the exchange, the on the side of the exchange has a digital and on the side of the participants at least one analog interface, and in which of a present in the interface unit generating circuit in response to signals transmitted by the exchange, generates metering pulses and transmitted to each participant ( DE 36 36 563 A1 ).
  • EP 0668687 relates to a device for generating a count signal in a communication system having a subscriber line interface circuit (SLIC device) and a subscriber line.
  • SLIC device subscriber line interface circuit
  • a circuit for generating charge pulses in the analog message transmission is known.
  • a corresponding charge indicator is controlled by the switchboard over the telephone line by separate charge signals.
  • a signal is taken at one point of the circuit which is an image of the total talk signal and the charge signal. The gained thereby
  • Total signal is rectified and fed to a comparator, which compares the same with a reference signal. If the amplitude of the rectified signal is greater than the amplitude of the reference signal, a signal is generated whose level is kept constant by using a memory element.
  • the charge pulse of, for example, 16 kHz can not be transmitted from the office. It must be generated after receiving a corresponding signal at the subscriber or in the interface unit (SU), to which the subscriber's telephone is connected via an electrical connection line. It must be ensured that even at maximum length of the connection line between the SU and the telephone of the subscriber a sufficiently high voltage of for example 140 mV arrives. For this purpose, a charge pulse having a level of, for example, 4.2 volts must be generated in the SU.
  • the maximum length of the connection line is, for example, for a cable with conductors of 0.4 mm diameter 4.5 km.
  • All elements of the SU including the power source or power sources must be designed for this maximum voltage on the one hand.
  • the extreme case "idle” must be considered when a very high-impedance telephone at 16 kHz with very short line or directly connected to the SU. Repercussions on the SU only do not occur when such a strong charge pulse is transmitted to a telephone with a maximum length of connection line. The characteristic impedance of such leads represents a sufficient "load”. With shorter leads, the control range of the supply current source of each participant can be exceeded by the alternating voltage amplitude occurring at it. This happens, for example, in the case of the above-mentioned idling, when the sum of the supply voltage of the telephone and the superimposed alternating charge voltage reaches or even exceeds the value of the regulated bias voltage of the supply current source.
  • the invention has the object of developing the circuit initially described so that phones can be operated with any length of leads without disturbing the SU.
  • the level of the metering pulses is measured as a function of the length of the respective connecting line. It is thereby ensured that the AC amplitude of the charge pulses from the generator circuit is always set to an allowable value.
  • the control range of the supply current source for the loop current can therefore not be exceeded.
  • the modulation of the loop current feed can be approximately halved with this circuit arrangement. This also halves the required voltage difference between the bias voltage of the supply current source and the telephone supply voltage can be obtained. The power loss of this circuit part is then also halved.
  • Another advantage of this circuit arrangement is the good reproducibility of the different levels for the charge pulses in series production. Particularly advantageous is the circuit arrangement for short leads and directly connected to the SU phones.
  • Fig. 1 schematically a section of a telephone network is shown.
  • participants Tln are connected via cable 1.
  • an interface unit SU is switched on in the transmission path.
  • the SU has on the side of the VST a digital interface for digital communication over the cable 1
  • the Tln are connected via analog interfaces with the SU, via electrical leads 2.
  • the SU is in a possible embodiment in the FIGS. 2 and 3 shown in more detail.
  • the SU has, as an intelligent component, a gate array GA, in which a generator circuit 3 bordered by a dashed line for generating charge pulses is contained. This includes a number of sine tables with control circuit 4 and a selector switch 5.
  • the GA also includes a pulse width modulator 6, a trigger circuit 7 and a measuring circuit 8.
  • the measuring circuit 8 is connected to a microprocessor ⁇ P having access to a ROM.
  • the analog interface of the SU to the Tln comprises a low-pass filter 9 and a DC-DC converter 10 (DC / DC converter 10).
  • the low-pass filter 9 is connected to the pulse width modulator 6.
  • the DC / DC converter 10 is connected to the trigger circuit 7 and the measuring circuit 8.
  • an amplifier 12 with two outputs connected for the LF signal. At these two outputs, the AC voltage U 1 is generated for the charge pulses.
  • the internal resistance of the circuit is determined by the termination impedance Z.
  • a transformer 13 is used for galvanic decoupling.
  • the connecting line 2 of a Tln is connected to the transformer 13, which is symbolized by the impedance Z L.
  • the terminal of the Tln is fed by the supply current source 11.
  • Tln falls from the AC voltage U 2 , which is set with the present circuit arrangement to the correct, dependent on the length of the connecting line 2 value.
  • the capacitor C is used for DC decoupling of the transformer 13.
  • the supply voltage for the off Fig. 3 apparent supply current source 11 can be generated to minimize the power loss via the clocked DC / DC converter 10, which is synchronized via a trigger pulse of the trigger circuit 7 (switching frequency about 93 kHz).
  • the DC / DC converter 10 automatically adjusts the required voltage by using For example, a transistor still allows a certain time after the trigger pulse turned on. The voltage is greater, the longer the duty cycle is.
  • This duty cycle of the transistor in the DC / DC converter 10 can determine the GA using the measuring circuit 8 by a counter at "0" starts at the beginning of the pulse and stops at the end of the pulse.
  • the counter read the microprocessor uP from the GA, so as to look up in ROM a matching value for the amplitude of the charge pulse to be generated.
  • the assignment of the measured values (counter reading) to certain amplitudes can, for. B. have been set in the laboratory on a pattern.
  • the selector switch 5 is then set in the generator circuit 3 of the GA so that the charge pulse arrives at the correct level at each Tln. This also applies to all subsequent metering pulses of this item.
  • the generator circuit 3 in the GA contains, for example, eight different sine tables with eight linear graduated signal amplitudes.
  • the ⁇ P can select via the selector switch 5 for the Tln a table with the appropriate amplitude value.
  • Each of the eight tables approximates a period of sine oscillation by discretization, for example, in 32 time steps.
  • Each time step is assigned a numerical value representing the height of the sinusoid at that time.
  • the circuit in the GA cyclically reads these numerical values by starting at "1" again after the time step "32".
  • the pulse width modulator 6 makes it possible to reconvert the numerical values into a continuous, analog sine oscillation with the aid of the low-pass filter 9.
  • the feeding of the charge impulses takes place according to Fig. 3 via the low-pass filter 9, which converts the pulses coming from the GA into a sine wave, and the LF outputs of the amplifier 12 instead, between which the AC voltage U 1 is generated.
  • the value for the terminating impedance Z is expediently chosen in such a way that it imitates the impedance Z L of the connection line of the respective subscriber in the speech frequency band (300 Hz to 3400 Hz) so that adaptation is possible. In Germany, this value in the voice band is 900 ohms, complex.
  • the impedance Z L of a maximum length of connection cable has a value of approximately 200 ohms.
  • the termination impedance Z then has a value of about 240 ohms, so that the required adjustment exists.
  • the voltage U 2 is then approximately equal to U 1/2. Of the Control range of the supply current source 11 is not exceeded
  • One of the FIGS. 2 and 3 deviating, simplified embodiment of the circuit arrangement goes from the 4 and 5 out.
  • the comparator 14 used here two different levels for the charge pulses can be set.
  • the one level corresponds to, for example, the maximum possible length of the connecting line 2.
  • the other level is set, for example, for about 1/3 of the maximum length of the connecting line 2.
  • the DC / DC converter 10 supplies the supply voltage U S regulated for the respective Tln as a function of the length of the connecting line 2.
  • the supply voltage U S is present at the one end Fig. 3 apparent circuit of Tln.
  • it is supplied to the one input of the comparator 14.
  • U ref At the second input of the comparator 14 is a reference voltage U ref , which corresponds to the reduced level for the charge pulses.
  • the low-pass filter 9 is supplied from a fixed level generator circuit 15, the maximum level for the charge pulses.
  • a switchable attenuator 16 is turned on by the comparator 14, by which the level of the charge pulses is limited to the reduced value.
  • the attenuator 16 may according to Fig. 5 For example, have a field effect transistor 17 whose current transmittance is changed by the comparator 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Meter Arrangements (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Electrophonic Musical Instruments (AREA)

Claims (3)

  1. Arrangement de circuit pour la génération d'impulsions de taxation lors de la transmission d'informations numériques, tel que des abonnés d'un réseau téléphonique sont reliés à un central par câble, tel que les téléphones des abonnés sont connectés par des lignes de raccordement électriques à une unité d'interfaces reliée au central téléphonique, qui comporte une interface numérique du côté du central téléphonique et au moins une interface analogique du côté des abonnés, et tel que l'unité d'interfaces comporte un circuit de génération qui est adapté pour, en fonction de signaux qui sont transmis depuis le central téléphonique, générer des impulsions de taxation et les transmettre à l'abonné respectif, caractérisé en ce que l'unité d'interfaces (SU) est en outre conçue de sorte que, pour chaque abonné (Tln) respectivement, une tension proportionnelle à la longueur de la ligne de raccordement (2) est mesurée lors de l'écoulement d'un courant de boucle dans le circuit électrique de son téléphone, qui est déduite de la tension d'alimentation requise d'une source de courant d'alimentation (11) connectée à la ligne de raccordement (2), et que la valeur de tension ainsi obtenue est utilisée pour le réglage du niveau de tension des impulsions de taxation sortant du circuit de détermination (3, 15).
  2. Arrangement de circuit selon la revendication 1, caractérisé en ce que l'unité d'interfaces est en outre adaptée pour que la valeur de tension soit fournie à un processeur (µP), dans lequel est mémorisée une table de comparaison correspondant à des longueurs différentes de la liaison de raccordement (2), de lequel une commande correspondant au niveau de tension requis est fournie au circuit de génération (3).
  3. Arrangement de circuit selon la revendication 1, caractérisé en ce que l'unité d'interfaces est en outre adaptée pour que la valeur de tension soit fournie à un comparateur (14), dont la sortie est reliée au circuit de génération (15) par un élément d'atténuation réglable (16).
EP97400135A 1996-02-01 1997-01-14 Agencement de circuit pour la génération d'impulsions de taxation Expired - Lifetime EP0788271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19603530A DE19603530C1 (de) 1996-02-01 1996-02-01 Schaltungsanordnung zur Erzeugung von Gebührenimpulsen
DE19603530 1996-02-01

Publications (3)

Publication Number Publication Date
EP0788271A2 EP0788271A2 (fr) 1997-08-06
EP0788271A3 EP0788271A3 (fr) 2003-11-05
EP0788271B1 true EP0788271B1 (fr) 2008-10-01

Family

ID=7784202

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400135A Expired - Lifetime EP0788271B1 (fr) 1996-02-01 1997-01-14 Agencement de circuit pour la génération d'impulsions de taxation

Country Status (4)

Country Link
US (1) US5862213A (fr)
EP (1) EP0788271B1 (fr)
AT (1) ATE410025T1 (fr)
DE (2) DE19603530C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69628833D1 (de) * 1996-08-30 2003-07-31 St Microelectronics Srl Schaltungsanordnung zur Erzeugung eines Gebührensignals in einem Kommunikationssystem
US6310953B1 (en) * 1997-07-24 2001-10-30 Fujitsu Limited Subscriber circuit
DE19959488A1 (de) * 1999-12-10 2001-06-13 Alcatel Sa Schaltungsanordnung zur Begrenzung des Eingangswiderstandes einer a/b-Schnittstelle eines Fernmeldenetzes
DE10146891C2 (de) * 2001-09-24 2003-08-14 Infineon Technologies Ag Verfahren zum Übertragen von Gebührenbestimmungssignalen über einen Datenübertragungspfad und Vorrichtung zur Spannungspegelgenerierung
DE10147082C2 (de) * 2001-09-25 2003-07-31 Infineon Technologies Ag Verfahren zum Übertragen von Gebührenbestimmungssignalen über einen Datenübertragungspfad unter Ausnutzung von Resonanzerscheinungen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857832A (ja) * 1981-09-30 1983-04-06 Fujitsu Ltd 課金信号中継方式
ES8700528A1 (es) * 1984-05-04 1986-10-01 Ates Componenti Elettron Perfeccionamientos en los circuitos telefonicos integrables monoliticamente.
IT1213181B (it) * 1984-06-22 1989-12-14 Ates Componenti Elettron Circuito telefonico, integrabile monoliticamente, generatore disegnali di comando per gli indicatori di tassazione d'utente.
AR241359A1 (es) * 1986-09-12 1992-05-29 Siemens Ag Disposicion de circuito para alimentar pulsos de cuenteo para el computo de tarifa en aparatos de abonado.
DE3636563A1 (de) * 1986-10-28 1988-05-05 Kabelmetal Electro Gmbh Schaltungsanordnung zur erzeugung von gebuehrenimpulsen fuer ein fernmeldetechnisches endgeraet
SE467333B (sv) * 1990-10-24 1992-06-29 Ericsson Telefon Ab L M Krets foer att alstra debiteringspulser avsedda foer presentation hos en teleabonnent
US5452345A (en) * 1994-01-21 1995-09-19 Advanced Micro Devices Metering signal level control circuit
DK0668706T3 (da) * 1994-01-27 1999-11-01 Siemens Schweiz Ag Netafslutningsenhed

Also Published As

Publication number Publication date
EP0788271A3 (fr) 2003-11-05
DE19603530C1 (de) 1997-05-15
EP0788271A2 (fr) 1997-08-06
US5862213A (en) 1999-01-19
DE59712970D1 (de) 2008-11-13
ATE410025T1 (de) 2008-10-15

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